During week 11 (March 13-19, 2016), influenza activity decreased slightly, but remained elevated in the United States.
March 27th, 2016
Synopsis:
During week 11 (March 13-19, 2016), influenza activity decreased slightly, but remained elevated in the United States.
- Viral Surveillance: The most frequently identified influenza virus type reported by public health laboratories during week 11 was influenza A, with influenza A (H1N1)pdm09 viruses predominating. The percentage of respiratory specimens testing positive for influenza in clinical laboratories decreased.
- Novel Influenza A Virus: One human infection with a novel influenza A virus was reported.
- Pneumonia and Influenza Mortality: The proportion of deaths attributed to pneumonia and influenza (P&I) was below the system-specific epidemic threshold in the NCHS Mortality Surveillance System and above the system-specific epidemic threshold in the 122 Cities Mortality Reporting System.
- Influenza-associated Pediatric Deaths: Two influenza-associated pediatric deaths were reported.
- Influenza-associated Hospitalizations: A cumulative rate for the season of 18.2 laboratory-confirmed influenza-associated hospitalizations per 100,000 population was reported.
- Outpatient Illness Surveillance: The proportion of outpatient visits for influenza-like illness (ILI) was 3.2%, which is above the national baseline of 2.1%. All 10 regions reported ILI at or above region-specific baseline levels. Puerto Rico and seven states experienced high ILI activity; New York City and eight states experienced moderate ILI activity; 20 states experienced low ILI activity; 15 states experienced minimal ILI activity; and the District of Columbia had insufficient data.
- Geographic Spread of Influenza: The geographic spread of influenza in Puerto Rico and 39 states was reported as widespread; Guam and 10 states reported regional activity; the District of Columbia and one state reported local activity; and the U.S. Virgin Islands did not report.
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